我有两个实体，它们有一对多的关系。
Purchase ----------------< lineCommand
我已将这些实体映射到一起，并且一切正常，至少在我想保存或删除购买时，除非我执行更新，只有父级（购买将更新）且子级不会更新。
这里是Purchase和lineCommand的DDL： LineCommand：
CREATE TABLE purchaseproduct
(
idpurchaseproduct serial NOT NULL,
idpurchase integer,
idproduct integer,
qty double precision,
price double precision,
CONSTRAINT purchaseproduct_pkey PRIMARY KEY (idpurchaseproduct),
CONSTRAINT purchaseproduct_idproduct_fkey FOREIGN KEY (idproduct)
REFERENCES product (idproduct) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT purchaseproduct_idpurchase_fkey FOREIGN KEY (idpurchase)
REFERENCES purchase (idpurchase) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
购买：
CREATE TABLE purchase
(
idpurchase serial NOT NULL,
code character varying(50),
date timestamp without time zone,
totalht double precision,
tva double precision,
totalttc double precision,
CONSTRAINT purchase_pkey PRIMARY KEY (idpurchase)
)
POJOS： LineCommand
@Entity
@Table(name = "purchaseProduct")
@Access(AccessType.PROPERTY)
public class LineCommand implements Serializable {
private LongProperty idPurchaseProduct;
private Product product;
private Purchase purchase;
private DoubleProperty sellPrice = new SimpleDoubleProperty();
private DoubleProperty qty = new SimpleDoubleProperty();
private DoubleProperty subTotal = new SimpleDoubleProperty();
public LineCommand() {
this.idPurchaseProduct = new SimpleLongProperty();
this.product = new Product();
this.purchase = new Purchase();
this.sellPrice = new SimpleDoubleProperty();
this.qty = new SimpleDoubleProperty();
this.subTotal = new SimpleDoubleProperty();
NumberBinding subTotalBinding = Bindings.multiply(this.qty, this.sellPrice);
subTotal.bind(subTotalBinding);
}
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "purchase_seq_gen")
@SequenceGenerator(name = "purchase_seq_gen", sequenceName = "purchaseproduct_idpurchaseproduct_seq", initialValue = 1, allocationSize = 1)
@Column(name = "idpurchaseproduct ", unique = true, nullable = false)
public long getIdPurchaseProduct() {
return idPurchaseProduct.get();
}
public LongProperty idPurchaseProductProperty() {
return idPurchaseProduct;
}
public void setIdPurchaseProduct(long idPurchaseProduct) {
this.idPurchaseProduct.set(idPurchaseProduct);
}
@ManyToOne
@JoinColumn(name = "idproduct")
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
@ManyToOne
@JoinColumn(name = "idpurchase")
public Purchase getPurchase() {
return purchase;
}
public void setPurchase(Purchase purchase) {
this.purchase = purchase;
}
@Column(name = "price")
public double getSellPrice() {
return sellPrice.get();
}
public DoubleProperty sellPriceProperty() {
return sellPrice;
}
public void setSellPrice(double sellPrice) {
this.sellPrice.set(sellPrice);
}
@Column(name = "qty")
public double getQty() {
return qty.get();
}
public DoubleProperty qtyProperty() {
return qty;
}
public void setQty(double qty) {
this.qty.set(qty);
}
@Transient
public double getSubTotal() {
return subTotal.get();
}
public DoubleProperty subTotalProperty() {
return subTotal;
}
public void setSubTotal(double subTotal) {
this.subTotal.set(subTotal);
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
} else {
Product product = ((LineCommand) obj).getProduct();
Purchase purchase = ((LineCommand) obj).getPurchase();
if (this.product.equals(product) && this.purchase.equals(purchase))
return true;
else
return false;
}
}
}
采购：
@Entity
@Table(name = "purchase")
@Access(AccessType.PROPERTY)
public class Purchase {
private LongProperty idPurchase;
private StringProperty codePurchase;
private ObjectProperty<LocalDate> datePurchase;
private DoubleProperty totalHt;
private DoubleProperty tva;
private DoubleProperty totalTTC;
private Set<LineCommand> lineItems = new HashSet<LineCommand>(0);
public Purchase() {
this.idPurchase = new SimpleLongProperty();
this.codePurchase = new SimpleStringProperty();
this.datePurchase = new SimpleObjectProperty<>();
this.totalHt = new SimpleDoubleProperty();
this.tva = new SimpleDoubleProperty();
this.totalTTC = new SimpleDoubleProperty();
}
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "purchase_seq_gen")
@SequenceGenerator(name = "purchase_seq_gen", sequenceName = "purchase_idpurchase_seq", initialValue = 1, allocationSize = 1)
@Column(name = "idpurchase", unique = true, nullable = false)
public long getIdPurchase() {
return idPurchase.get();
}
public LongProperty idPurchaseProperty() {
return idPurchase;
}
public void setIdPurchase(long idPurchase) {
this.idPurchase.set(idPurchase);
}
@Column(name = "code")
public String getCodePurchase() {
return codePurchase.get();
}
public StringProperty codePurchaseProperty() {
return codePurchase;
}
public void setCodePurchase(String codePurchase) {
this.codePurchase.set(codePurchase);
}
@Column(name = "date")
@Convert(converter = LocalDatePersistanceConverter.class)
public LocalDate getDatePurchase() {
return datePurchase.get();
}
public ObjectProperty<LocalDate> datePurchaseProperty() {
return datePurchase;
}
public void setDatePurchase(LocalDate datePurchase) {
this.datePurchase.set(datePurchase);
}
@Column(name = "totalHt")
public double getTotalHt() {
return totalHt.get();
}
public DoubleProperty totalHtProperty() {
return totalHt;
}
public void setTotalHt(double totalHt) {
this.totalHt.set(totalHt);
}
@Column(name = "tva")
public double getTva() {
return tva.get();
}
public DoubleProperty tvaProperty() {
return tva;
}
public void setTva(double tva) {
this.tva.set(tva);
}
@Column(name = "totalTTC")
public double getTotalTTC() {
return totalTTC.get();
}
public DoubleProperty totalTTCProperty() {
return totalTTC;
}
public void setTotalTTC(double totalTTC) {
this.totalTTC.set(totalTTC);
}
@OneToMany(mappedBy = "purchase", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
public Set<LineCommand> getLineItems() {
return this.lineItems;
}
public void setLineItems(Set<LineCommand> lineItems) {
this.lineItems = lineItems;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
} else {
if (this.idPurchase.getValue() == ((Purchase) obj).getIdPurchase())
return true;
else
return false;
}
}
}
她在那里我通过DAO进行了一些更新：
Purchase
public boolean update(Purchase obj) {
try {
if (!session.isOpen())
session = DatabaseUtil.getSessionFactory().openSession();
session.beginTransaction();
Purchase purchase = session.get(Purchase.class, obj.getIdPurchase());
purchase.setCodePurchase(obj.getCodePurchase());
purchase.setDatePurchase(obj.getDatePurchase());
purchase.setTotalHt(obj.getTotalHt());
purchase.setTva(obj.getTva());
purchase.setTotalTTC(obj.getTotalTTC());
//purchase.getLineItems().clear();
// Here where i set line items
// purchase.setLineItems(obj.getLineItems());
session.getTransaction().commit();
session.close();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
注意：只有父级才会更新，因此更新不会级联。
答案 0 :(得分：0)
obj.getLineItems()返回一组分离的实例（它们与当前的Hibernate会话无关）。解决问题的最简单方法是在提交事务之前合并Purchase：
purchase = session.merge(purchase);
这样，合并操作将级联到关联的LineCommand实例。